基于底板高渗砂岩的裂隙瓦斯截流抽采技术

Intercepting and Drainage Technology of Fissure Gas Based on Floor Sandstone with High Permeability

针对唐家河煤矿384采区底板砂岩中的裂隙瓦斯在底板裂隙水疏排之后上溢造成31847工作面和巷道瓦斯超限的实际问题,提出了截流抽采采区底板砂岩裂隙瓦斯的治理技术。通过在31847机巷施工63°大俯角下行穿层钻孔,对穿透384采区底板砂岩上溢的裂隙瓦斯进行截流抽采,并通过数值模拟确定了截流钻孔的合理间距为8 m。应用结果表明,施工截流钻孔后,工作面回风瓦斯浓度始终控制在0.8%以内,同时在瓦斯治理过程中截流抽采了约69.12万m3的裂隙瓦斯,彻底消除了31847工作面瓦斯超限的隐患。

In view of the problem of gas overlimit in 31847 working face and roadway,which was caused by the fissure gas in the floor sandstone in 384 mining area of Tangjiahe Coal Mine overflows after the floor fissure water drainage. The controlling technology of intercepting and drainage fissure gas of floor sandstone in the mining area was put forward. Through drilling at downward layer at 63° angle of depression in 31847 machine lane,the fissure gas that gushing into the floor sandstone in 384 mining area was intercepted and drained,the rational space between intercepting boreholes was determined to be 8 m through numerical simulation. The application results showed that the volume fraction of the return gas in the working face was always within 0. 8% after the intercepting drilling,at the same time,about 691. 2 thousand m3 of fissure gas was cut off and pumped in the process of gas control,completely eliminating the hidden danger of gas over limit in 31847 working face.